Dharmi Engineers Butterfly Valve, Wafer Type, Slim-Seal design, maintenance free shutoff. This butterfly valves excess other conventional valves such as gate valve and globe valves in all aspects, especially in terms of light weight, less number of component, no flange gaskets required and economical operation and maintenance costs.

Dharmi Engineers Slim Seal design Butterfly Valves body seat mechanism have a very low torque, tight shut off with zero leakage, compact actuator selection, and long life smooth easy operation. The slim-seal, center disc design valves are widely available with different combination of body, seat & disc materials to satisfy the need of most industrial application.

Up to 250NB Flow-Control Lever Operated
and above Gear Operated. On special request Gear
Operation also available from 80NB size.

Butterfly
Valve Special
Options :

Off Set Disc Design Butterfly Valve for high pressure & temperature service.

Moulded / Replaceable Seat option

Gear / Pneumatic Rotary Actuator Operated

P.T.F.E. (PFA/FEP) Lined Butterfly Valve

Flanged End, Butterfly Valve

Damper Type Butterfly Valve for High Temperature Air Service

Off Set Disc Design Butterfly Valve for high pressure & temperature service

Tailor Made Valve

Butterfly
Valve Material
of Construction :

Disc

Seat (Liner)

Cast Iron to ASTM A 126 Class B
IS 210 GR. FG 200 / 220 / 260

Ductile Iron to ASTM A 536 Grade 65-45-12

Cast Carbon Steel to ASTM A 216 GR. WCB

Stainless Steel to ASTM A 351 GR. CF 8 / 8M / 3 / 3M

Aluminium Bronze ASTM B 148-C95400

Nylon Coating on C.I. / D.I. / WCB / S.S. Disc Material

EPDM / Neoprene / Hypalon ® / Nitrile Rubber / Buna-N

RubberEncapsulated on C.I. / D.I. / WCB / S.S. Disc Material

P.T.F.E. (PFA / FEP) Lined on C.I. / D.I. / WCB / S.S. Disc Material

EPDM

EPDM Food Grade

Buna – N

Black Nitrile

Neoprene

Hypalon
®

Silicon

Viton
®

P.T.F.E.

Body

Stem

Cast Iron to ASTM A 126 Class B
IS 210 GR. FG 200 / 220 / 260

Ductile Iron to ASTM A 536 Grade 65-45-12

Cast Carbon Steel to ASTM A 216 GR. WCB

Stainless Steel to ASTM A 351 GR. CF 8 / 8M / 3 / 3M

AISI 410 (S.S. 410 – 13% Cr. Steel)

AISI 304 (S.S. 304)

AISI 316 (S.S. 316)

AISI 304L (S.S. 304L)

AISI 316L (S.S. 316L)

Carbon Steel to BS 970

Butterfly Valve Standard Test :

Body Test

1.5 times the working pressure with water. This test is performed after valve assembly and with disc in half position open, it is called as a body hydro test.

Seat Test

1.5 times the working pressure with water.

Function / Operation Test

At the time of final inspection, each valve and its actuator (Flow-Control Lever / Gear / Pneumatic Actuator), under goes a complete operating test (Open/Close). This test carried out without pressure and at ambient temperature. It ensures the correct operation of the valve / actuator assembly with accessories such as solenoid valve, limit switches, air filter regulator etc.

Special Test

On request, any other test can be carried out according to special instruction by client